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【题目】We did ____ experiment in physics class.

A.aB.anC.anyD./

【答案】B

【解析】

句意:我们在物理课上做了一个实验。

考查冠词。a用于以辅音音素开始的单词前,表示一个;an用于以元音音素开始的单词前,表示一个;any在肯定句表示任何,在否定句和疑问句表示一些;根据experiment是可数名词,且是以元音音素开始的单词,所以用an,故选B。

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